Basically a ground up build excluding a few parts because im not paying 40 dollars for a slode catch. Used just to test for functionality and for proof of concept. Below is a complete list of aftermarket parts. Aip enchanced loading spring Aip 120% recoil spring Aip aluminum 4.3 guide plug Aip charging cocking handle 5.1 Aip seer spring Aip stainless steel trigger bar Am infinity qb seer bar and hammer Am X2 5.1 hicapa aluminum slide Cowcow thread adapter Cowcow stainless steel grip screws Cowcow RM1 hicapa guide rod 5.1 Dr.Black 5.1 dinging outer barrel Edge ultra light blowback housing v2 Nineball hop up wheel Nineball magazine catch Nineball slim grip Nineball rr frame Nineball 6.03 5.1 barrel Nineball thumb safety lefty Maple leaf decepticon bucking 70 degree Maple leaf hop up unit Maple leaf I key Mancraft mjolnir amplifier Stainless steel TM Magazine Primary airsoft hicapa m4 adapter